$ sudo apt-get remove mailsync 

Uninstall mailsync including dependent package

If you would like to remove mailsync and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove mailsync 

Use Purging mailsync

If you use with purge options to mailsync package all the configuration and dependent packages will be removed.

$ sudo apt-get purge mailsync 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove mailsync 

See Also,